Hammer-drill.



A. J. CARTER.

HAMMER DRILL. APPLICATION FILED D110. 23. 1912, RENEWED MAR. 28, 1914.

' Patented Nov. 3, 1914-" 2 SHEETS-SHEET 1.

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A. J. CARTER.

HAMMER DRILL. APPLICATION FILED DBO. 23, 1912. RENEWED MAR. 28, 1914. 1,1 1 5,898.

2 SHEETS-SHEET 2.

Patented N0v.'3, 1914.

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ANDREWJ. onarna, or vrcron, COLORADO.

HAMMER-DRILL.

Specification of Letters Patent.

Application filed December 23, 1912, Serial No. 738,140. Renewed Marchas, 1914. Serial No. 328,096. I

To all whom it may concern Be it known that I, ANDREW J. CARTER, acitizen of the United States, residing at the city of Victor, county ofTeller, and State of Colorado, have invented certain new and usefulImprovements in Hammer Drills; and I do declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled inthe art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to theletters andv figures of referencemarked thereon, which form a part ofthis specification.

My invention relates to hammer drills and may be said to constitute animprovement over the machine of'my application Serial No. 661,288, filedNoveinberQOth, 1911.

The principal object of the present invention is to provide means forfeeding water through the drill steel to the cutting face thereof.

Other objects will appear hereinafter as I proceed with that embodimentof the invention which for the purposes of the present application Ihave illustrated in the 'accompanying drawings, in which:

' Figure 1 is a longitudinal, horizontal, sectional view showing theoperating niecha nis m in plan with certain of the partsbroken away.Fig. 2 is a vertical section-taken approximately upon the line'22 Fig.1, and looking in the direction of the arrow. Fig. 8 is a cross sectionupon the line 3+3 Fig. 1, looking in the directionof the .arrow, theparts being shown upon a larger scale. Fig. 4 is a central longitudinalsection taken upon a line corresponding to the line -14-'-, Fig. 3,.andlooking in the direction of the arrow. Fig. 5 is a detail end view ofthe striking surface of the hammer.

The same reference characters refer to like parts in each of the views.

Let the numeral 5 designate the cylindrical portion of thedrillcasing,which is closed at the ends by plates 6 and 7 secured to the cylindricalportion by means of bolts 8, or

other suitable fastenings. A removable cover 9, of a curvaturecorresponding to that of the casing, is mounted in the top thereof andnear the rear end. Depending from the bottom of the casing near the rearend is a sleeve 10 which is adapted to beconnected shaped wayswithinwhich ridesa hammer 13, having a rearwardly extending portion 14,upon which is pivotedat 15 a stem 16 having a T-head 17 Curved leafsprings 18 are "secured upon the portion 14: of the hammer and hear attheir extremities upon'stem l6, tendingto hold the latter in line withthe axis of the hammer. A spiral spring 19 surrounds the stem 16 andbears at one end against the hammer 13 and at the opposite end againstthe partition 20. Partition 20 has a vertical slot 21 therein, throughwhi h stem 16 slides. a i

PatentedN ov. 3, 1 914. I

A transverse shaft22 is ournaledin bear ings 23 which are splithorizontally, the

lower half of each bearing being in the easing and theupper' half beingin the cover 9, whereby the shaft may be lifted out ofplace when thecovert) is removed. i

Midway of its length the. shaft 22 is formed into three U-shaped arms 24extending radially at angles of 120 degrees, the

arms 24 being adapted, upon rotation of the shaft 2-2, to engage theT-head 17 of the stem 16, and draw the latter rearwardly against theaction of the spring 1 9. It will there fore be apparent that the blowdelivered by the hammer 13 is due to the action of the spring 19, andthat three such blows will be delivered for each revolutionof theshaft22. Also fixed upon shaft 22 is a spiral gear 25 which meshes witha second spiral gear 26, fixed upon the longitudinal shaft 27 Upon thisrear shaft, near its end is fastened. a gear wheel 28 which meshes witha gear29 for imparting rotation to the drill steel, as will hereinafterappear; Theshaft 22is squared at 30 for the reception of ahand crank(not shown) by means of which it may bei.turned, though it should beunderstood that I do not limit myself to a hand driven drill as certainforms ofpower may 1 tain minor details, is shown and described in myprevious application above referred to and it is therefore consideredunnecessary to describe the same more at length in the presentspecification.

Integral with the forward plate 6 are rearwardly extending arms 31across the ends of which is mounted a flat bar 32 having a circularopening in the middle to form a journal for one extremity of the sleeve33 which also passes through a circular opening of the same size in theplate 6. The gear wheel 29, above mentioned, is secured upon this sleeve33 by means of a set screw 34.

The drill steel 35 is slidably mounted within the sleeve 33 but isprevented from turning therein by the lug 36 which is set into the steel35 and engages a slot 37 in the sleeve. The steel 35 has a duct 38extending axially from one end to the other, the duct being enlarged atits intersection with the rear face of the drill to form a socket 39 ofspherical contour.

' The spherical head 40 of a water conducting tube 41 is arranged to fitwithin the socket 39, the engaging surfaces being smooth to permitrotational movement. The tube 41 is threaded into a T-coupling 42, intothe other openings of which are threaded'shafts 43 and 44 formingtogether a rock-shaft which is mounted in journals 45 and 46, the shaft43 having a collar 47 thereon, held in the desired position by a setscrew 48. In the preferred embodiment of my invention the shaft 44 ismade in the form of a pipe and has a water hose 49 upon its outerextremity, leading from any source of water supply. Other forms of waterconnections may be employed, however, and in this respect I desire tolimit my invention only as indicated in the claims hereunto appended.

A spring 50 is coiled about the rock-shaft and bears at one end againstthe back of the tube 41 and at the opposite end against the casing 5whereby the tube head 40 is held in engagement with the socket 39 at alltimes.

The hammer 13 has a socket 51 cut into its striking face, of a size andshape to surround the tube 41 and spherical head 40, when the hammer isin contact with the drill steel.

From the foregoing description the operation of my improved drill willbe evident.

' Rotation of the shaft 22 serves to actuate the hammer and at the sametime, by means of the spiral gears 25 and 26, shaft 27, and gears 28 and29, to slowly rotate the sleeve 33 carrying with it the drill steel 35.Water is continually fed through the hose 49, pipe 44, tube 41 anopening leading from the spiral head 40 into the duct 38 and thence tothe cutting end of the drill steel, the spring 50 causing the head 40 tofollow the drill steel at each stroke of the hammer. The hose 49, beingflexible, will permit of the slight rocking motion to which the pipe 44is subjected by the reciprocation of the drill steel.

I claim as my invention:

1. In combination a drill steel having a water duct extendinglongitudinally there through, a pivotally mounted water conductor havingan opening adapted to register with the rear end of said duct, a springarranged to press said conductor against the rear surface of the drill,and a hammer having reciprocating motion only, said hammer having arecess in its striking surface arranged to surround a portion of saidconductor.

2. In combination a drill steel mounted for reciprocative and rotationalmovements, said steel having a water duct extending axially therethrough, a pivotally mounted water conductor having an opening adaptedto register with the rear end of said duct, resilient means for causingsaid opening and duct to remain in register during the reciprocation ofthe drill steel, and a hammer having reciprocating motion only, saidhammer hafvinga recess in its striking surface arranged to surround thatportion of the conductor which is within the path of the hammer.

3. In a hammer drill, a drill steel, means for imparting theretoreciprocative and rotary motions, said steel having a water ductextending axially there through the rear end of said duct being enlargedto form a socket of spherical contour, apivotally mounted waterconductor having a spherical extremity adapted to fit within saidsocket, saidspherical extremity having an opening adapted to registerwith said duct, and resilient means arranged to act upon the waterconductor for holding its spherical extremity in position within saidsocket during the reciprocation and rotation of the drill steel.

4. In combination a drill steel having a water duct extendinglongitudinally there through, a tubular water conductor having oneextremity in register with the rear end of said duct, a rock-shaftmounted at right angles to the conductor, upon which the latter issecured, and resilient means acting upon the conductor to hold its saidextremity against the rear face of the drill steel.

5. In combination a drill steel having a water duct extendinglongitudinally there through, a tubular water conductor having oneextremity in register with the end of said duct, a rock-shaft mounted atright angles to the conductor, upon which the latter is secured, saidrock-shaft being hollow and open at one end for connection with a Intestimony whereof I aflix my signature "getter suppylsoillrce, agoifntIhetween the conin presence of two witnesses.

uctor an 0 OW s a t avin a Water passage there through and resilt entmeans ANDREW CARTER acting uponthe conductor to hold its said Witnesses:extremity against the rear face of the drill SANS T. GRADY, steel. M. W.GALLOWAY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner oftlatents;

. 7 Washington, D. C.

